[OpenLayers-Users] Change in API stopping a test app working?

[nick@hogweed.org]

Hello Erik (or anyone else),

Remember a couple of weeks ago I talked about implementing my own annotations 
layer? Got it to work in the end but now it appears to have stopped working 
so I'm guessing the code has changed. I now get the error:

Error: this.tileSize has no properties
Source File: http://openlayers.org/dev/lib/OpenLayers/Layer/Grid.js
Line: 130

Has something in the api changed? I didn't get this error before.

Source files are main.js, osmlayer.js and osmtile.js at 
nick.dev.openstreetmap.org/openlayers.

Thanks,
Nick